java.lang.Thread.checkAccess()方法实例
java.lang.Thread.checkAccess() 方法确定当前运行的线程是否有权修改该线程。
声明
以下是java.lang.Thread.checkAccess()方法的声明
public final void checkAccess()
参数
-
NA
返回值
此方法不返回任何值。
异常
-
SecurityException -- 如果当前线程不允许访问该线程。
例子
下面的例子显示java.lang.Thread.checkAccess()方法的使用。
package com.yiibai; import java.lang.*; public class ThreadDemo { public static void main(String args[]){ new ThreadClass("A"); Thread t = Thread.currentThread(); try { /* determines if the currently running thread has permission to modify this thread */ t.checkAccess(); System.out.println("You have permission to modify"); } /* if the current thread is not allowed to access this thread, then it result in throwing a SecurityException. */ catch(Exception e) { System.out.println(e); } } } class ThreadClass implements Runnable { Thread t; String str; ThreadClass(String str) { this.str = str; t = new Thread(this); // this will call run() function t.start(); } public void run() { System.out.println("This is run() function"); } }
让我们来编译和运行上面的程序,这将产生以下结果:
You have permission to modify This is run() function